Physics :)

Equilibrium occurs when

A barge is being pulled along a canal by two ropes that make equal angles with the direction in which the barge points. Assuming the two pulls on the barge are equal, in what direction does the barge move?

A clothesline is stretched between two trees. A tire hangs in the middle of the line and the two halves of the line make equal angles with the horizontal. The tension in the line is ..

A scalar quantity has

You are helping your aunt move a piano on wheels from one room to another. When you push the piano horizontally, it moves at constant speed. What can you say about the piano?

Galileo found that a ball rolling down one inclined plane would roll how far up another inclined plane?

Friction is a force that always acts

The law of inertia states that an object

After a cannonball is fired into friction-less space, the amount of force needed to keep it going equals

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. The reason this can be done is that

The force required to maintain an object at a constant speed in free space is equal to

One object has twice as much mass as another object. The first object also has twice as much

Compared to its weight on Earth, a 10-kg object on the moon will weigh

Compared to its mass on Earth, the mass of a 10-kg object on the moon is

Which has more mass, a kilogram of feathers or a kilogram of iron?

A bag of canned goods has a mass of 10.0 kilograms and a weight of

You and a friend are jumping on a trampoline. Why does Earth, which is rapidly orbiting around the sun, not move under your feet when you jump?

T or F. Mass is a vector quantity.

T or F. Force is a vector quantity.

T or F. If a hockey puck were to slide on a perfectly friction-less surface, it will eventually slow down because of its inertia.

T or F. If you were to slide a hockey puck across a friction-less ice rink, there must be a horizontal force on it to keep it in motion.

T or F. The SI unit of mass is the newton.

T or F. An astronaut has the same mass on Earth as in space.

T or F. The reason a penny thrown straight up inside an airplane will come back to your hand is that you, the air inside the plane, and the penny are all moving at the same horizontal velocity.

(picture of rainbow shape) The vertical speed of the ball at point II is the same as its vertical speed at point

(picture of rainbow shape) When is the horizontal velocity the greatest?

(picture of rainbow shape) When is the vertical velocity zero?

A vector quantity has

When representing velocity as a vector,

The horizontal component of a projectile’s velocity is independent of

At the instant a ball is thrown horizontally with a large force, an identical ball is dropped from the same height. Which ball hits the ground first?

A ball is thrown into the air at some angle. At the very top of the ball’s path, its velocity is

An object is dropped and falls freely to the ground with an acceleration of g (-10m/s/s)/ If it is thrown upward at an angle instead, its acceleration would be

After a rock that is thrown straight up reaches the top of its path and is starting to fall back down, its acceleration is (neglecting air resistance)

An airplane flying into a head wind loses ground speed, and an airplane flying with the wind gains ground speed. If an airplane flies at right angles to the wind, then ground speed is

Suppose a small plane can fly at 170 km/h relative to the surrounding air. Suppose also that there is a 60 km/h tailwind (going in the same direction as the plane). How fast does the plane’s shadow move across the ground?

A ball is thrown straight upward with an initial vertical velocity of 20 m/s. Ideally (no air resistance), the ball will return to the thrower’s hand with a speed of

When you look at the speedometer in a moving car, you can see the car’s

(picture of curve bottom left to top right) At what point is the instantaneous velocity largest?

(picture of curve bottom left to top right) The graph above illustrates an object moving with

Acceleration is defined as the CHANGE in

Suppose you are in a car that is going around a curve. The speedometer reads a constant 30 miles per hour. Which of the following is NOT true?

As an object falls freely in a vacuum, its

In the absence of air resistance, objects fall at constant

Consider drops of water leaking from a water faucet. As the drops fall for a longer time they

If you drop a feather and a coin on the moon (from the same height and same time), which will land first?

Given below is the graph representing the position-time graphs of two swimmers (A and B), swimming in a pool along a straight line. Both the swimmers start from two different positions. Use the graph to find when and where swimmer B passes swimmer A.

T or F. A single vector can be replaced by two vectors in the x- and y-directions that are a right angles to each other.

T or F. A The vertical component of velocity in projectile motion is identical to the velocity component of free fall.

T or F. The rate at which velocity changes with time is called acceleration.

T or F. Velocity is different from speed in that velocity is speed in a given direction.

T or F. The length of a vector represents its magnitude.

A 15-N force and a 45-N force act on an object in opposite directions (180 degrees). What is the net force on the object?

The weight of a person can be represented by a vector that acts

Accelerations are produced by

The acceleration produced by a net force on an object is

When an object reaches terminal velocity its acceleration

Suppose the force of friction on a sliding object is 25 N. The force needed to maintain a constant velocity is

A book weighs 4 N. When held at rest in your hands, the net force on the book is

An apple weighs 1 N. The net force on the apple when it is in free fall is

An object has a constant mass. A constant force on the object produces constant

A push on a 1-kg brick accelerates the brick. Neglecting friction, to equally accelerate a 10-kg brick, one would have to push

Suppose a particle is accelerated through space by a constant 10-N force. Suddenly the particle encounters a second force of 10-N in a direction opposite to that of the first force. The particle

Pressure is defined as

Which of the following would exert the most pressure on the ground?

A tennis ball and a solid steel ball with the same diameter are dropped at the same time. They land at the same time. Which ball has the greater force of gravity acting on it?

A tennis ball and a solid steel ball with the same diameter are dropped at the same time. In the absence of air resistance, which ball has the greater acceleration due to gravity?

As a care package falls from a high-flying stationary helicopter, its velocity increases and its acceleration

If you pull horizontally on a desk with a force of 150 N and the desk doesnt move, the friction force must be 150 N. Now if you pull with 250 N so the desk slides at constant velocity, the friction force is

When the angle of an incline with a block resting on it increases, the normal support force

A karate chop delivers a blow of 2300 N to a board that breaks. The force that acts on the hand during this feat

Consider a ball rolling down the decreasing slope inside a semicircular bowl. As the ball rolls from the rim downward toward the bottom, its acceleration

If the force acting on a cart doubles, what happens to the cart’s

You are on a frozen pond, and the ice starts to crack. If you lie down on the ice and begin to crawl, this will

If a truck has ten times the mass of a car and the two vehicles are pushed with an equal force, you would expect the acceleration of the truck to be

Whenever an object exerts a force on another object, the second object exerts a force of the same magnitude, but in the opposite direction to that of the first object.

A high school student hits a nail with a hammer. During the collision, there is a force

A player hits the ball with a bat. The action force is the impact of the bat against the ball. What is the reaction to this force?

A person is attracted towards the center of Earth by a 440-N gravitational force. The force with which Earth is attracted toward the person is

An unfortunate bug splatters against the windshield of a moving car. Compared to the force of the car on the bug, the force of the bug on the car is

An unfortunate bug splatters against the windshield of a moving car. Compared to the acceleration of the car, the acceleration of the bug is

Two people pull on a rope in a tug-of-war. Each pulls with 400 N of force. Is the tension in the rope 400 N?

(picture of circle with circle with circle) The horizontal turntable shown above rotates at a constant rate. As viewed from above a coin on the turntable moves counterclockwise in a circle as shown. Which of the following vectors best represents the direction of the frictional force exerted on the coin by the turntable when the coin is in the position shown?

Which has greater linear speed (tangental), a horse near the outside rail of a merry-go-round or a horse near the inside rail?

Which has greater rotational speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?

What is the direction of the force that acts on clothes in the spin cycle of a washing machine?

A tin can whirled on the end of a string moves in a circle because

If you whirl a tin can on the end of a string and the string suddenly breaks, the can will

A car travels in a circle with constant speed. The net force on the car

*When a racecar rounds a banked track, the centripetal force needed comes not from friction, but from the

*Earth rotates and revolves through space. Earth rotates about the ____, which is an ____ axis. Earth revolves about the _____, which is an _____ axis.

The momentum of an object is defined as the object’s

Which has more momentum, a large mass truck moving at 30 miles per hour or a small mass truck moving at 30 miles per hour?

Compared to a sports car moving 30 miles per hour, the same sports car moving at 60 miles per hour has

If the momentum of an object changes and its mass remains constant

The momentum change of an object is equal to the

In order to increase the final momentum of a golf ball, we could

The reason padded dashboards are used in cars is that they

A cannonball is fired from a cannon. Compared to the force on the ball, the force on the cannon is

*A cannonball is fired from a cannon. Compared to the impulse (change in momentum) on the ball, the impulse on the cannon is

Momentum of a system is conserved only when

A freight train rolls along a track with considerable momentum. If t were to roll at the same speed but had twice as much mass, its momentum would be

A cannon recoils from launching a cannonball. The speed of the cannon’s recoil is small because the

Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, they reach the ground at the same time, but A has a higher

In order to catch a ball, a baseball player moves his or her hand backward in the direction of the ball’s motion. Doing this reduces the force of impact on the player’s hand principally because

A car traveling along the highway needs a certain amount of force exerted on it to stop. More stopping force may be required when the car has

A cannon fires a cannonball. The speed of the cannonball will be the same as the speed of the recoiling cannon if

When you jump off a step, you usually bend your knees as you reach the ground. By doing this, the time of the impact is about 10 times more what it would be in a stiff-legged landing, and the average force on your body is reduced by

A moving freight car runs into an identical car at rest on the track. The cars couple together. Compared to the velocity of the first car before the collision, the velocity of the combined cars after the collision is

A cannonball shot from a long-barrel cannon travels faster than one shot from a short-barrel cannon because the cannonball recieves a greater

T or F. Momentum is inertia in motion.

T or F. A child on a merry-go-round rotates around the merry-go-round’s axis.

A girl whose weight is 500 N hangs from the the middle of a bar supported by two vertical strands of rope. What is the tension in each strand?

A 15-N force and a 45-N force act on an object in opposite directions, but in a straight line. What is the net force on the object?

Burl and Paul stand on their sign-painting scaffold. Which letter in the diagram below shows the greatest tension in the LEFT rope?

T or F. Force is a vector quantity, which means it includes magnitude and direction.

Suppose a car is moving in a straight line and steadily increases its velocity. During the first second, the car moves from 35 km/hr to 40 km/hr. During the next second it moves from 40 km/hr to 45 km/hr. What is the car’s average acceleration?

Suppose you take a trip to Grandma’s house that takes 3 hours. Her house is approximately 180 km from your home. What is your average speed during the trip?

Suppose you are in a car that is going around a curve. The speedometer reads a constant 30 km/hr. Which of the following is NOT true?

Which of the following units can be used to describe speed and/or velocity?

A pencil lies stationary on your desk. If the Earth is moving around the sun at a speed of 30 km/sec, how fast is the pencil moving relative to the desk? How fast is the pencil moving relative to the sun?

An object is dropped and falls freely (i.e. not influenced by friction or wind resistance) to the ground with an acceleration of g. If it is thrown upward instead, its acceleration would be

During each second of free fall an object picks up

The slope of a speed-versus-time graph represents

A projectile is fired horizontally in a vacuum. The projecticle maintains its horizontal component of speed because it

T or F. A single vector (or resultant) can be replaced by two component vectors in the x- and y-directions that are at right angles to each other.

A ball is thrown into the air at some angle. At the very top of the ball’s path, its velocity is

A book weighs 4 N. When held at rest in your hands, the net force on the book is

An object has a constant mass. A constant force on the object produces constant

A force of 3 N accelerates a mass of 3 kg at the rate of 1 m/s2. The acceleration of a mass of 6 kg acted upon by the same 3 N force is

An apple weighs 6 N. The net force on the apple when it is in free fall is

If the force acting on a cart doubles, what happens to the cart’s acceleration (as long as the cart’s mass remains the same)?

Which has greater angular speed (Rotational), a horse near the outside rail of a merry-go-round or a horse near the inside rail?

Earth’s gravitational force provides the inward centripetal force to keep the moon orbiting the earth. However, the reason the moon does not fall into Earth is that _____.

Compared to a sports car moving at 30 miles per hour, the same sports car moving at 60 miles per hour has

A job is done slowly, and an identical job is done quickly. Both jobs require the same amount of work but different amounts of

If Nellie Newton pushes an object with twice the force for twice the distance, she does

The unit of power is the

T or F. Energy is changed from one form of energy to another form with no net loss or gain.

If an object has kinetic energy, then it also MUST have

An object that has kinetic energy MUST have